Transcript Digestive powerpoint

Warm Up!
Starting today you will have to formulate the
answer to the questions from your exam last
Friday.
CBA (6 WEEK EXAM) NEXT WEDNESDAY!
You will HAVE to write all over your exam in
order to receive credit ;)
EXTRA CREDIT OPPORTUNITY…due wed.
Quick review of the last two days…
one person please explain
HYDROLYSIS
one person please explain DEHYDRATION SYNTHESIS
How can ENZYMES play a part in this?
Digestive Man…
• Take 3 minutes to label the man in the picture
you have.
• PREDICT where the following organs belong…
Liver
Large Intestines
Pancreas
Anus
Small Intestines
Esophagus
Stomach
Salivary Glands
Rectum
Gall Bladder Mouth
Digestive
System
Remember levels of organization?
Where are we now?
Atom  Molecule  Macromolecule
 Organelle  Cell  Tissue 
Organ  Organ System  Organism!
WHAT IS DIGESTION?
process by which food & drinks are broken down into
their smallest parts so that the body can use them
Notes: THE DIGESTIVE SYSTEM
Digestive Tract (Alimentary Canal)
1.
2.
3.
4.
5.
6.
7.
Mouth
Esophagus
Stomach
Small Intestine
Large Intestine
Rectum
Anus
Other Digestive Organs
A.
B.
C.
D.
Salivary Glands
Liver
Gall Bladder
Pancreas
Structures
Each bullet represents a box on your handout. Write the name of the
structure inside the box and draw a picture to represent its function.
• Mouth
• *Small Intestine
• Esophogus
• Large Intestine
• Stomach
• Rectum
• Helping Organs:
-pancreas
-gallbladder
• Anus
FUNCTIONS OF DIGESTIVE
ORGANS
Remember…
Starches are
complex
carbohydrates!
Mouth - digestion begins here.
* Chemical Digestion Saliva has the ENZYME
AMYLASE which breaks down
carbohydrates: starches into
simple sugars(glucose).
* Physical or Mechanical
Digestion - teeth tear food into
smaller pieces.
Functions
*Tongue- Works to roll the food into a ball called
a BOLUS.
*Esophagus-. Transportation tube
leading from mouth to stomach
*Moves food with muscular contractions
called peristalsis
*Ring of muscles at bottom relax to allow
food into stomach and contract to keep
food from coming back up
No digestion occurs in the esophagus
Functions
• Stomach- Gastric juices (hydrochloric acid
and enzymes) work with muscle
contractions to reduce the size of the food
particles.
* Stomach acid activates the pepsin
that digests protein into smaller proteins.
*The food becomes a cream-like
liquid called CHYME.
Think…How
does
hydrochloric
acid affect
enzymes in the
stomach?
*Hydrochloric Acid (HCl) - breaks
down proteins and kills
microorganisms
*Pepsin - enzyme which helps break
down proteins and lipids.
*Mucus protects lining of stomach
from acids.
*Food with all of these chemicals is
now called chyme
*Liver –Produces bile to help digest
lipids
– Bile breaks down lipids into
FATTY ACIDS and GLYCEROL.
–Filters toxins from the blood
* Gall Bladder –stores the bile until it is needed.
Digestion
Small Intestine –
Final digestion occurs here and nutrients
are absorbed by the small intestine villi.
Function
• Large Intestine- Whatever the body
cannot put to use is sent to the large
intestine.
• Water is now released into the blood
stream.
• This spends about 12 hours becoming
FECES and later leaves the body through
the anal opening.
However……..
• Not EVERYTHING we eat is digested
• Undigested fats, proteins and
carbohydrates leave the body through the
anal opening.
Make sure you have the
organs properly labeled!
Large Intestine
Small
Intestine
GREEN CHART
• Complete the green chart with the function
of each organ we have learned about
today and it’s role in digestion!